Training is a very large stage with a grid for a background. The grid is scored with large gray boxes, each made of a 10 X 10 set of small gray squares. Larger colored squares indicate multiples of 5 and 10, with the former being blue and the latter being red. In addition, a large red line labelled 0 is present in the flat plane section. The distance to the blast zones from 0 on Final Destination and Battlefield are also displayed.

The stage is divided into three sections: a large flat solid platform on the right, a Battlefield section in the middle and a section with a single vertical wall to the left. All solid ledges are grabbable. The primary revival platform drops players directly on the 0 line.

The stage has a unique camera which always faces the stage straight on, so that the grid will not be subject to parallax error, however certain final smashes are able to bypass this temporarily. Contrary to common belief, the stage itself is not two-dimensional, and thus hitboxes will behave normally on it.